It is critical to avoid configuration mistakes, as there is no way to undo data issues.
避免配置错误非常重要，没有任何方法来撤销数据上的错误。
Oracle supports a mechanism called Multi-Version Read Consistency which is implemented by undo data in the undo segments.
Oracle支持一种称为Multi - Version ReadConsistency的机制，这是用undo段中的undo数据实现的。
I've shown how to build the connection, construct an SQL command, retrieve the data, make changes, and either undo changes or apply them back to the database.
我展示了如何构建连接，构造SQL命令，检索数据，进行更改，以及撤销更改或将其应用到数据库中。
Our databases use their logs for before and after images of data (Undo and do records) and state information.
数据库在数据(Undo和do记录)和状态信息映象之前和之后使用日志。
This way undo logic is encapsulated with the same business logic that originally transformed the data.
使用相同的业务逻辑将这种Undo逻辑封装起来，原始地传递数据。
But very few teams bother to create scripts that undo schema changes, and fewer still manage to create automated scripts to deal with changes in data.
但是很少有团队会费力气创建能取消模式变化的脚本，而且成功地创建了处理数据变化的自动脚本的团队更少。
Deleting the sensitive columns from the old table and preserving the data from those columns for audit purposes or to ensure the ability to do an undo.
从旧表中删除敏感列，并保留那些列中的数据，以便用于审计或者确保可以执行撤销。
A deleted data buffer should be offered in addition to the regular, incremental, multiple Undo because it complements it.
已删除数据的缓冲区应该和常规的渐增多次撤销一起提供，因为它们具有互补性。
But before modifying data, initial values are copied to a work area called "undo segment".
但是在修改数据之前，先前的数值会被拷贝到一个叫做“撤销段”的工作区域中。
Recovering lost data or undoing incorrect, committed changes. For example, if you mistakenly delete or update rows, and then commit them, you can immediately undo the mistake.
恢复丢失的数据或撤销已经提交的错误。例如如果你不小心删除或更新了行，并且做了提交操作，你可以立刻撤销这个错误。
You can perform the undo operation only if all affected data generation plans are closed.
只有当所有受影响的数据生成计划都已关闭时，才能执行撤消操作。
You can tell it to undo or redo actions, but you can't inspect those actions or selectively save data in the current undo stack.
您可以让它撤消或重做动作，但您无法检查这些动作或选择性地将数据保存在当前的撤消堆栈中。
The transaction log records the start of each transaction, the changes to the data, and, if necessary, enough information to undo the modifications made during that transaction.
事务日志记录每个事务的启动、数据更改，必要时还记录用于撤消在该事务中所做修改的足够信息。
The transaction log records the start of each transaction, the changes to the data, and, if necessary, enough information to undo the modifications made during that transaction.
事务日志记录每个事务的启动、数据更改，必要时还记录用于撤消在该事务中所做修改的足够信息。
应用推荐